1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
21 * permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
42 #include <sys/kernel.h>
43 #include <sys/conf.h>
44 #include <sys/ctype.h>
45 #include <sys/bio.h>
46 #include <sys/bus.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/proc.h>
50 #include <sys/errno.h>
51 #include <sys/time.h>
52 #include <sys/disk.h>
53 #include <sys/fcntl.h>
54 #include <sys/limits.h>
55 #include <sys/sysctl.h>
56 #include <geom/geom.h>
57 #include <geom/geom_int.h>
58 #include <machine/stdarg.h>
59
60 struct g_dev_softc {
61 struct mtx sc_mtx;
62 struct cdev *sc_dev;
63 struct cdev *sc_alias;
64 int sc_open;
65 int sc_active;
66 };
67
68 static d_open_t g_dev_open;
69 static d_close_t g_dev_close;
70 static d_strategy_t g_dev_strategy;
71 static d_ioctl_t g_dev_ioctl;
72
73 static struct cdevsw g_dev_cdevsw = {
74 .d_version = D_VERSION,
75 .d_open = g_dev_open,
76 .d_close = g_dev_close,
77 .d_read = physread,
78 .d_write = physwrite,
79 .d_ioctl = g_dev_ioctl,
80 .d_strategy = g_dev_strategy,
81 .d_name = "g_dev",
82 .d_flags = D_DISK | D_TRACKCLOSE,
83 };
84
85 static g_init_t g_dev_init;
86 static g_fini_t g_dev_fini;
87 static g_taste_t g_dev_taste;
88 static g_orphan_t g_dev_orphan;
89 static g_attrchanged_t g_dev_attrchanged;
90
91 static struct g_class g_dev_class = {
92 .name = "DEV",
93 .version = G_VERSION,
94 .init = g_dev_init,
95 .fini = g_dev_fini,
96 .taste = g_dev_taste,
97 .orphan = g_dev_orphan,
98 .attrchanged = g_dev_attrchanged
99 };
100
101 /*
102 * We target 262144 (8 x 32768) sectors by default as this significantly
103 * increases the throughput on commonly used SSD's with a marginal
104 * increase in non-interruptible request latency.
105 */
106 static uint64_t g_dev_del_max_sectors = 262144;
107 SYSCTL_DECL(_kern_geom);
108 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff");
109 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW,
110 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single "
111 "delete request sent to the provider. Larger requests are chunked "
112 "so they can be interrupted. (0 = disable chunking)");
113
114 static char *dumpdev = NULL;
115 static void
g_dev_init(struct g_class * mp)116 g_dev_init(struct g_class *mp)
117 {
118
119 dumpdev = getenv("dumpdev");
120 }
121
122 static void
g_dev_fini(struct g_class * mp)123 g_dev_fini(struct g_class *mp)
124 {
125
126 freeenv(dumpdev);
127 }
128
129 static int
g_dev_setdumpdev(struct cdev * dev)130 g_dev_setdumpdev(struct cdev *dev)
131 {
132 struct g_kerneldump kd;
133 struct g_consumer *cp;
134 int error, len;
135
136 if (dev == NULL)
137 return (set_dumper(NULL, NULL));
138
139 cp = dev->si_drv2;
140 len = sizeof(kd);
141 kd.offset = 0;
142 kd.length = OFF_MAX;
143 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd);
144 if (error == 0) {
145 error = set_dumper(&kd.di, devtoname(dev));
146 if (error == 0)
147 dev->si_flags |= SI_DUMPDEV;
148 }
149 return (error);
150 }
151
152 static void
init_dumpdev(struct cdev * dev)153 init_dumpdev(struct cdev *dev)
154 {
155
156 if (dumpdev == NULL)
157 return;
158 if (strcmp(devtoname(dev), dumpdev) != 0)
159 return;
160 if (g_dev_setdumpdev(dev) == 0) {
161 freeenv(dumpdev);
162 dumpdev = NULL;
163 }
164 }
165
166 static void
g_dev_destroy(void * arg,int flags __unused)167 g_dev_destroy(void *arg, int flags __unused)
168 {
169 struct g_consumer *cp;
170 struct g_geom *gp;
171 struct g_dev_softc *sc;
172 char buf[SPECNAMELEN + 6];
173
174 g_topology_assert();
175 cp = arg;
176 gp = cp->geom;
177 sc = cp->private;
178 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name);
179 snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
180 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK);
181 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
182 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
183 g_detach(cp);
184 g_destroy_consumer(cp);
185 g_destroy_geom(gp);
186 mtx_destroy(&sc->sc_mtx);
187 g_free(sc);
188 }
189
190 void
g_dev_print(void)191 g_dev_print(void)
192 {
193 struct g_geom *gp;
194 char const *p = "";
195
196 LIST_FOREACH(gp, &g_dev_class.geom, geom) {
197 printf("%s%s", p, gp->name);
198 p = " ";
199 }
200 printf("\n");
201 }
202
203 static void
g_dev_attrchanged(struct g_consumer * cp,const char * attr)204 g_dev_attrchanged(struct g_consumer *cp, const char *attr)
205 {
206 struct g_dev_softc *sc;
207 struct cdev *dev;
208 char buf[SPECNAMELEN + 6];
209
210 sc = cp->private;
211 if (strcmp(attr, "GEOM::media") == 0) {
212 dev = sc->sc_dev;
213 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
214 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK);
215 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK);
216 dev = sc->sc_alias;
217 if (dev != NULL) {
218 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
219 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf,
220 M_WAITOK);
221 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf,
222 M_WAITOK);
223 }
224 return;
225 }
226
227 if (strcmp(attr, "GEOM::physpath") != 0)
228 return;
229
230 if (g_access(cp, 1, 0, 0) == 0) {
231 char *physpath;
232 int error, physpath_len;
233
234 physpath_len = MAXPATHLEN;
235 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
236 error =
237 g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
238 g_access(cp, -1, 0, 0);
239 if (error == 0 && strlen(physpath) != 0) {
240 struct cdev *old_alias_dev;
241 struct cdev **alias_devp;
242
243 dev = sc->sc_dev;
244 old_alias_dev = sc->sc_alias;
245 alias_devp = (struct cdev **)&sc->sc_alias;
246 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp,
247 dev, old_alias_dev, physpath);
248 } else if (sc->sc_alias) {
249 destroy_dev((struct cdev *)sc->sc_alias);
250 sc->sc_alias = NULL;
251 }
252 g_free(physpath);
253 }
254 }
255
256 struct g_provider *
g_dev_getprovider(struct cdev * dev)257 g_dev_getprovider(struct cdev *dev)
258 {
259 struct g_consumer *cp;
260
261 g_topology_assert();
262 if (dev == NULL)
263 return (NULL);
264 if (dev->si_devsw != &g_dev_cdevsw)
265 return (NULL);
266 cp = dev->si_drv2;
267 return (cp->provider);
268 }
269
270 static struct g_geom *
g_dev_taste(struct g_class * mp,struct g_provider * pp,int insist __unused)271 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
272 {
273 struct g_geom *gp;
274 struct g_consumer *cp;
275 struct g_dev_softc *sc;
276 int error, len;
277 struct cdev *dev, *adev;
278 char buf[SPECNAMELEN + 6], *val;
279
280 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
281 g_topology_assert();
282 gp = g_new_geomf(mp, "%s", pp->name);
283 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
284 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF);
285 cp = g_new_consumer(gp);
286 cp->private = sc;
287 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
288 error = g_attach(cp, pp);
289 KASSERT(error == 0,
290 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
291 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev,
292 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name);
293 if (error != 0) {
294 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
295 __func__, gp->name, error);
296 g_detach(cp);
297 g_destroy_consumer(cp);
298 g_destroy_geom(gp);
299 mtx_destroy(&sc->sc_mtx);
300 g_free(sc);
301 return (NULL);
302 }
303 dev->si_flags |= SI_UNMAPPED;
304 sc->sc_dev = dev;
305
306 /* Search for device alias name and create it if found. */
307 adev = NULL;
308 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) {
309 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name);
310 buf[14 + len] = 0;
311 val = getenv(buf);
312 if (val != NULL) {
313 snprintf(buf, sizeof(buf), "%s%s",
314 val, gp->name + len);
315 freeenv(val);
316 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK,
317 &adev, dev, "%s", buf);
318 adev->si_flags |= SI_UNMAPPED;
319 break;
320 }
321 }
322
323 dev->si_iosize_max = MAXPHYS;
324 dev->si_drv2 = cp;
325 init_dumpdev(dev);
326 if (adev != NULL) {
327 adev->si_iosize_max = MAXPHYS;
328 adev->si_drv2 = cp;
329 init_dumpdev(adev);
330 }
331
332 g_dev_attrchanged(cp, "GEOM::physpath");
333 snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
334 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK);
335
336 return (gp);
337 }
338
339 static int
g_dev_open(struct cdev * dev,int flags,int fmt,struct thread * td)340 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
341 {
342 struct g_consumer *cp;
343 struct g_dev_softc *sc;
344 int error, r, w, e;
345
346 cp = dev->si_drv2;
347 if (cp == NULL)
348 return(ENXIO); /* g_dev_taste() not done yet */
349 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
350 cp->geom->name, flags, fmt, td);
351
352 r = flags & FREAD ? 1 : 0;
353 w = flags & FWRITE ? 1 : 0;
354 #ifdef notyet
355 e = flags & O_EXCL ? 1 : 0;
356 #else
357 e = 0;
358 #endif
359 if (w) {
360 /*
361 * When running in very secure mode, do not allow
362 * opens for writing of any disks.
363 */
364 error = securelevel_ge(td->td_ucred, 2);
365 if (error)
366 return (error);
367 }
368 g_topology_lock();
369 error = g_access(cp, r, w, e);
370 g_topology_unlock();
371 if (error == 0) {
372 sc = cp->private;
373 mtx_lock(&sc->sc_mtx);
374 if (sc->sc_open == 0 && sc->sc_active != 0)
375 wakeup(&sc->sc_active);
376 sc->sc_open += r + w + e;
377 mtx_unlock(&sc->sc_mtx);
378 }
379 return(error);
380 }
381
382 static int
g_dev_close(struct cdev * dev,int flags,int fmt,struct thread * td)383 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
384 {
385 struct g_consumer *cp;
386 struct g_dev_softc *sc;
387 int error, r, w, e;
388
389 cp = dev->si_drv2;
390 if (cp == NULL)
391 return(ENXIO);
392 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
393 cp->geom->name, flags, fmt, td);
394
395 r = flags & FREAD ? -1 : 0;
396 w = flags & FWRITE ? -1 : 0;
397 #ifdef notyet
398 e = flags & O_EXCL ? -1 : 0;
399 #else
400 e = 0;
401 #endif
402 sc = cp->private;
403 mtx_lock(&sc->sc_mtx);
404 sc->sc_open += r + w + e;
405 while (sc->sc_open == 0 && sc->sc_active != 0)
406 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0);
407 mtx_unlock(&sc->sc_mtx);
408 g_topology_lock();
409 error = g_access(cp, r, w, e);
410 g_topology_unlock();
411 return (error);
412 }
413
414 /*
415 * XXX: Until we have unmessed the ioctl situation, there is a race against
416 * XXX: a concurrent orphanization. We cannot close it by holding topology
417 * XXX: since that would prevent us from doing our job, and stalling events
418 * XXX: will break (actually: stall) the BSD disklabel hacks.
419 */
420 static int
g_dev_ioctl(struct cdev * dev,u_long cmd,caddr_t data,int fflag,struct thread * td)421 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
422 {
423 struct g_consumer *cp;
424 struct g_provider *pp;
425 off_t offset, length, chunk;
426 int i, error;
427
428 cp = dev->si_drv2;
429 pp = cp->provider;
430
431 error = 0;
432 KASSERT(cp->acr || cp->acw,
433 ("Consumer with zero access count in g_dev_ioctl"));
434
435 i = IOCPARM_LEN(cmd);
436 switch (cmd) {
437 case DIOCGSECTORSIZE:
438 *(u_int *)data = cp->provider->sectorsize;
439 if (*(u_int *)data == 0)
440 error = ENOENT;
441 break;
442 case DIOCGMEDIASIZE:
443 *(off_t *)data = cp->provider->mediasize;
444 if (*(off_t *)data == 0)
445 error = ENOENT;
446 break;
447 case DIOCGFWSECTORS:
448 error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
449 if (error == 0 && *(u_int *)data == 0)
450 error = ENOENT;
451 break;
452 case DIOCGFWHEADS:
453 error = g_io_getattr("GEOM::fwheads", cp, &i, data);
454 if (error == 0 && *(u_int *)data == 0)
455 error = ENOENT;
456 break;
457 case DIOCGFRONTSTUFF:
458 error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
459 break;
460 case DIOCSKERNELDUMP:
461 if (*(u_int *)data == 0)
462 error = g_dev_setdumpdev(NULL);
463 else
464 error = g_dev_setdumpdev(dev);
465 break;
466 case DIOCGFLUSH:
467 error = g_io_flush(cp);
468 break;
469 case DIOCGDELETE:
470 offset = ((off_t *)data)[0];
471 length = ((off_t *)data)[1];
472 if ((offset % cp->provider->sectorsize) != 0 ||
473 (length % cp->provider->sectorsize) != 0 || length <= 0) {
474 printf("%s: offset=%jd length=%jd\n", __func__, offset,
475 length);
476 error = EINVAL;
477 break;
478 }
479 while (length > 0) {
480 chunk = length;
481 if (g_dev_del_max_sectors != 0 && chunk >
482 g_dev_del_max_sectors * cp->provider->sectorsize) {
483 chunk = g_dev_del_max_sectors *
484 cp->provider->sectorsize;
485 }
486 error = g_delete_data(cp, offset, chunk);
487 length -= chunk;
488 offset += chunk;
489 if (error)
490 break;
491 /*
492 * Since the request size can be large, the service
493 * time can be is likewise. We make this ioctl
494 * interruptible by checking for signals for each bio.
495 */
496 if (SIGPENDING(td))
497 break;
498 }
499 break;
500 case DIOCGIDENT:
501 error = g_io_getattr("GEOM::ident", cp, &i, data);
502 break;
503 case DIOCGPROVIDERNAME:
504 if (pp == NULL)
505 return (ENOENT);
506 strlcpy(data, pp->name, i);
507 break;
508 case DIOCGSTRIPESIZE:
509 *(off_t *)data = cp->provider->stripesize;
510 break;
511 case DIOCGSTRIPEOFFSET:
512 *(off_t *)data = cp->provider->stripeoffset;
513 break;
514 case DIOCGPHYSPATH:
515 error = g_io_getattr("GEOM::physpath", cp, &i, data);
516 if (error == 0 && *(char *)data == '\0')
517 error = ENOENT;
518 break;
519 case DIOCGATTR: {
520 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
521
522 if (arg->len > sizeof(arg->value)) {
523 error = EINVAL;
524 break;
525 }
526 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value);
527 break;
528 }
529 default:
530 if (cp->provider->geom->ioctl != NULL) {
531 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td);
532 } else {
533 error = ENOIOCTL;
534 }
535 }
536
537 return (error);
538 }
539
540 static void
g_dev_done(struct bio * bp2)541 g_dev_done(struct bio *bp2)
542 {
543 struct g_consumer *cp;
544 struct g_dev_softc *sc;
545 struct bio *bp;
546 int destroy;
547
548 cp = bp2->bio_from;
549 sc = cp->private;
550 bp = bp2->bio_parent;
551 bp->bio_error = bp2->bio_error;
552 bp->bio_completed = bp2->bio_completed;
553 bp->bio_resid = bp->bio_length - bp2->bio_completed;
554 if (bp2->bio_error != 0) {
555 g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
556 bp2, bp2->bio_error);
557 bp->bio_flags |= BIO_ERROR;
558 } else {
559 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
560 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
561 }
562 g_destroy_bio(bp2);
563 destroy = 0;
564 mtx_lock(&sc->sc_mtx);
565 if ((--sc->sc_active) == 0) {
566 if (sc->sc_open == 0)
567 wakeup(&sc->sc_active);
568 if (sc->sc_dev == NULL)
569 destroy = 1;
570 }
571 mtx_unlock(&sc->sc_mtx);
572 if (destroy)
573 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
574 biodone(bp);
575 }
576
577 static void
g_dev_strategy(struct bio * bp)578 g_dev_strategy(struct bio *bp)
579 {
580 struct g_consumer *cp;
581 struct bio *bp2;
582 struct cdev *dev;
583 struct g_dev_softc *sc;
584
585 KASSERT(bp->bio_cmd == BIO_READ ||
586 bp->bio_cmd == BIO_WRITE ||
587 bp->bio_cmd == BIO_DELETE ||
588 bp->bio_cmd == BIO_FLUSH,
589 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
590 dev = bp->bio_dev;
591 cp = dev->si_drv2;
592 sc = cp->private;
593 KASSERT(cp->acr || cp->acw,
594 ("Consumer with zero access count in g_dev_strategy"));
595 #ifdef INVARIANTS
596 if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
597 (bp->bio_bcount % cp->provider->sectorsize) != 0) {
598 bp->bio_resid = bp->bio_bcount;
599 biofinish(bp, NULL, EINVAL);
600 return;
601 }
602 #endif
603 mtx_lock(&sc->sc_mtx);
604 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
605 sc->sc_active++;
606 mtx_unlock(&sc->sc_mtx);
607
608 for (;;) {
609 /*
610 * XXX: This is not an ideal solution, but I belive it to
611 * XXX: deadlock safe, all things considered.
612 */
613 bp2 = g_clone_bio(bp);
614 if (bp2 != NULL)
615 break;
616 pause("gdstrat", hz / 10);
617 }
618 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
619 bp2->bio_done = g_dev_done;
620 g_trace(G_T_BIO,
621 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
622 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
623 bp2->bio_data, bp2->bio_cmd);
624 g_io_request(bp2, cp);
625 KASSERT(cp->acr || cp->acw,
626 ("g_dev_strategy raced with g_dev_close and lost"));
627
628 }
629
630 /*
631 * g_dev_callback()
632 *
633 * Called by devfs when asynchronous device destruction is completed.
634 * - Mark that we have no attached device any more.
635 * - If there are no outstanding requests, schedule geom destruction.
636 * Otherwise destruction will be scheduled later by g_dev_done().
637 */
638
639 static void
g_dev_callback(void * arg)640 g_dev_callback(void *arg)
641 {
642 struct g_consumer *cp;
643 struct g_dev_softc *sc;
644 int destroy;
645
646 cp = arg;
647 sc = cp->private;
648 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
649
650 mtx_lock(&sc->sc_mtx);
651 sc->sc_dev = NULL;
652 sc->sc_alias = NULL;
653 destroy = (sc->sc_active == 0);
654 mtx_unlock(&sc->sc_mtx);
655 if (destroy)
656 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
657 }
658
659 /*
660 * g_dev_orphan()
661 *
662 * Called from below when the provider orphaned us.
663 * - Clear any dump settings.
664 * - Request asynchronous device destruction to prevent any more requests
665 * from coming in. The provider is already marked with an error, so
666 * anything which comes in in the interrim will be returned immediately.
667 */
668
669 static void
g_dev_orphan(struct g_consumer * cp)670 g_dev_orphan(struct g_consumer *cp)
671 {
672 struct cdev *dev;
673 struct g_dev_softc *sc;
674
675 g_topology_assert();
676 sc = cp->private;
677 dev = sc->sc_dev;
678 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
679
680 /* Reset any dump-area set on this device */
681 if (dev->si_flags & SI_DUMPDEV)
682 set_dumper(NULL, NULL);
683
684 /* Destroy the struct cdev *so we get no more requests */
685 destroy_dev_sched_cb(dev, g_dev_callback, cp);
686 }
687
688 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
689